Abstract
Magnetoresistance above T c is studied on a sintered sample of YBa 2Cu 3O 7-δ up to 4T using a field-modulation technique. The magnetoresistance Δϱ near T c diverges as ε −5 2 , with ε ¬ ( T - T c )/ T c , and is quantitatively explained by the 3D behavior of Aslamasov-Larkin (AL) term in superconducting fluctuations. From the analysis, ξ c(0) = 2.0 ± 0.5 A ̊ and ξ ab(0) = 16.4 ± 0.2 A ̊ are derived for the inter and the intra layer coherence lengths. From the analysis of Maki-Thompson (MT) term, τ L ≲ 3 × 10 −14 s is derived for the phase-breaking time τ L , which implies a strong pair-breaking; ħ/τ L ⩾ 2.7 k T c . Several consequences of the stron pair-breaking are discussed. Temperature independent magnetoresistance Δϱ/ϱ ≅ 7 × 10 −6/(Tesla) 2 is also observed at higher temperatures, and its possible connection to an intrinsic transport mechanism is suggested.
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